What is the difference between inactive and vacation? Is it that vacation is something you choose for a certain amount of time and inactiveness is if you don't log in for a certain amount of time? How long are the amounts of time? If you're inactive for a period of time do you loose your colonies?

So if you're inactive, do your colonies disappear? A person who talked to me on Ikariam and who helped me out with Silanthous, went inactive and after a while disappeared. The reason why I ask is I want to build my 5th town on my first island because I've built up the resources on that one... but there's no space on the island, but it has 3 inactive people.